On Mon, 24 Aug 2015 17:13:23 +0200 Petr Mladek <pmladek@xxxxxxxx> wrote:
> The commit 1dfb059b9438633b0546 ("thp: reduce khugepaged freezing
> latency") fixed khugepaged to do not block a system suspend. But
> the result is that it could not get interrupted before the given
> timeout because the condition for the wait event is "false".
What are the userspace-visible effects of this bug?
> This patch puts back the original approach but it uses
> freezable_schedule_timeout_interruptible() instead of
> schedule_timeout_interruptible(). It does the right thing.
> I am pretty sure that the freezable variant was not used in
> the original fix only because it was not available at that time.
>
> The regression has been there for ages. It was not critical. It just
> did the allocation throttling a little bit more aggressively.
>
> I found this problem when converting the kthread to kthread worker API
> and trying to understand the code.
>
> ...
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